CA2265296C - Sealed battery and method of manufacturing the same - Google Patents

Sealed battery and method of manufacturing the same Download PDF

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Publication number
CA2265296C
CA2265296C CA002265296A CA2265296A CA2265296C CA 2265296 C CA2265296 C CA 2265296C CA 002265296 A CA002265296 A CA 002265296A CA 2265296 A CA2265296 A CA 2265296A CA 2265296 C CA2265296 C CA 2265296C
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Canada
Prior art keywords
sealing material
sealing
battery
electrical insulating
sealed battery
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Expired - Fee Related
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CA002265296A
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French (fr)
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CA2265296A1 (en
Inventor
Yoshinori Kida
Toshikazu Yoshida
Ryuji Ohshita
Toshiyuki Nohma
Koji Nishio
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Publication of CA2265296A1 publication Critical patent/CA2265296A1/en
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Publication of CA2265296C publication Critical patent/CA2265296C/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/191—Inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/195—Composite material consisting of a mixture of organic and inorganic materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49108—Electric battery cell making
    • Y10T29/4911—Electric battery cell making including sealing

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

The opening to be sealed in a battery is sealed with an electrical insulating sealant S by placing an electrical insulating sealing material C, including a first sealing material A that is soften by heat applied for sealing and a second sealing material B that is more difficult to soften by the heat applied for sealing than the first sealing material A, and by heating and successively cooling the electrical insulating sealing material C. Thus, a sealed battery with few defectives such as a sealing failure and a short-circuit can be manufactured in a high yield rate.

Description

10152025CA 02265296 2003-12-31TITLE OF THE INVENTIONSEALED BATTERY ANDMETHOD OF MANUFACTURING THE SAMEBACKGROUND OF THE INVENTIONThe present invention relates to a sealed battery and a method ofmanufacturing the sealed battery.Sealing of a battery for preventing leakage of the electrolyte solution andprotecting a water reactive active material used therein is conventionallyconducted by placing a sealing material on the opening of the housing of thebattery, and melting and then cooling the sealing material thereon.In this sealing process, when the opening of the battery requiresprevention of a short-circuit, a sealing material with an electrical insulatingproperty is particularly used.Therefore, any of electrical insulating materials, such as polyethylene andpolypropylene, that can be adhered to the housing when thermally molten by heatapplied for sealing was used as the conventional sealing material.However, such a conventional heat-melting adhesive sealing material caneasily flow out of the opening during the sealing process, and hence, the sealingtends to be incomplete. Such incomplete sealing can result in leakage of theelectrolyte solution and a short life of the battery. Also, in the case where thesealing material also serving as the electrical insulating material flows out, ashort-circuit can be easily caused when the housing is slightly deformed by the10152025CA 02265296 l999-03- 15sealing heat, resulting in decreasing the yield rate of batteries.SUMMARY OF THE INVENTIONIn consideration of the aforementioned conventional disadvantages, anobject of the invention is providing a sealed battery with few defectives such as asealing failure and a short-circuit and a method of manufacturing the sealedbattery in a high yield rate.The method of manufacturing a sealed battery of this invention comprisesa step of forming an electrically insulating sealant S for sealing an opening byplacing an electrical insulating sealing material C, including a first sealingmaterial A that is molten by heat applied for sealing and a second sealingmaterial B that is more difficult to soften by the heat applied for sealing than thefirst sealing material A, on the opening and by heating and successively coolingthe electrical insulating sealing material C.Alternatively, the sealed battery of this invention comprises an electricalinsulating sealant S for sealing an opening, and the electrical insulating sealant Sincludes a first sealing material A that is molten by heat applied for sealing and asecond sealing material B that is more difficult to soften by the heat applied forsealing than the first sealing material A.In this manner, the invention provides a sealed battery with fewdefectives such as a sealing failure and a short-circuit and a method ofmanufacturing the sealed battery in a high yield rate.BRIEF DESCRIPTION OF THE DRAWINGSA more complete appreciation of the invention and many of the attendant210152025CA 02265296 l999-03- 15advantages thereof will be readily obtained as the same become better understoodby reference to the following detailed description when considered in connectionwith the accompanying drawings, wherein:Figure 1 is a perspective View for showing procedures adopted in anexample of the invention; andFigure 2 is a sectional View of a lithium secondary battery manufacturedin the example of the invention.DETAILED DESCRIPTION OF THE INVENTIONAccording to a method of manufacturing a sealed battery of the invention,in sealing an opening with an electrical insulating sealant S, an electricalinsulating sealing material C including a first sealing material A that is molten byheat applied for sealing and a second sealing material B that is more difficult tosoften by the heat applied for sealing than the first sealing material A is placed onthe opening. This sealing material C is heated and then cooled on the opening,so as to form the electrical insulating sealant S.A sealed battery according to the invention comprises an electricalinsulating sealant S for sealing an opening including a first sealing material Athat is molten by heat applied for sealing and a second sealing material B that ismore difficult to soften by the heat applied for sealing than the first sealingmaterial A.The first sealing material A is not herein specified and can be anyelectrical insulating sealing materials as far as a part of or all the material can bethermally molten to be adhered onto a material of a housing or the like in theopening. Preferable examples of the first sealing material A include polyolefins10152025CA 02265296 l999-03- 15such as polyethylene, polypropylene and polybutene, among which polyethyleneand polypropylene having a melting point of 110°C through 170°C are morepreferred.The second sealing material B can be any of electrical insulating sealingmaterials that are more difficult to soften by the sealing heat than the firstsealing material A. Specific examples include poly(ethylene terephthalate),alumina and silica, among which poly(ethylene terephthalate) is preferred. Inthe case where a material with a significantly low melting point, such aspolyethylene, is used as the first sealing material A, polypropylene that has ahigher melting point and is more difficult to soften can be used as the secondsealing material B. As the second sealing material B, a material that is notsubstantially softened by the sealing heat is preferably used. In order that thefirst sealing material A alone is molten but the second sealing material B is notsubstantially softened during the sealing process, it is preferred, from a Viewpoint of sealing workability, that the second sealing material B has a softeningpoint higher by 50°C or more than the melting point of the first sealing material A.Means for applying the sealing heat is not herein specified. For example,external heating means such as a heater or magnetic induction heating meanscan be used.The first sealing material A is not specified in its shape because it ismolten in the sealing process. In contrast, the second sealing material B shouldretain its original shape after the sealing process so as to provide the sealedportion of the housing with the electrical insulting property, and therefore isMore preferably, the second sealingpreferably in the form of a mesh or a powder.material B is in the form of a mesh which can be entangled with the molten first410152025CA 02265296 l999-03- 15sealing material A during the sealing process so as to exhibit an effect ofsuppressing the first sealing material A from flowing out of the opening to besealed.The first sealing material A functions not only as a part of the electricalinsulating sealant S after the sealing process but also as an adhesive with beingpartly or entirely molten during the sealing process. In a conventional method ofmanufacturing a sealed battery, the battery is sealed with this first sealingmaterial A alone. Therefore, the sealing material can flow out of the openingduring the sealing process, resulting in occasionally causing a sealing failure. Incontrast, according to the method of the invention, the second sealing material Bis used in addition to the first sealing material A. The second sealing material Bfunctions as a part of the electrical insulating sealant S after the sealing processsimilarly to the first sealing material A. In addition, the second sealing materialB is more difficult to soften by the sealing heat than the first sealing material A,and hence is more difficult to flow out of the opening to be sealed during thesealing process. Accordingly, when the present method is adopted, even if thehousing or the like of the battery is slightly deformed by the sealing heat, asealing failure and a short-circuit can be avoided.Other features of the invention will become more apparent in the course ofthe following descriptions of exemplary embodiments which are given forillustration of the invention and not intended to be limiting thereof.Various kinds of card type sealed lithium secondary batteries, respectivelyusing different sealants in their openings, were manufactured as follows, so as toexamine the incidence of a short-circuit and the capacity degradation ratio duringcharge-discharge cycles.10152025CA 02265296 l999-03- 15 :A mixture including LiCoO2 serving as a positive electrode active material,artificial graphite serving as a conducting agent, and poly(vinylidene fluoride)serving as a binder in a ratio by weight of 8:1:1 and N-methyl-2-pyrollidone werekneaded to give a slurry. The slurry was applied on one surface of an aluminumfoil serving as a collector by a doctor blade method, and the resultant foil wasdried under vacuum at a temperature of 150°C for 2 hours. In this manner, aplate-shaped positive electrode (with a size of 6.4 cm x 2.4 cm x 0.15 cm) wasprepared. :A mixture including a natural graphite powder (having a lattice spacingdooz between lattice planes (002) of 3.35 A and an Le, a crystallite size in the c-axisdirection, exceeding 1000A) serving as a lithium ion intercalating agent andpoly(vinylidene fluoride) serving as a binder in a ratio by weight of 9:1 and N-methyl-2-pyrollidone were kneaded to give a slurry. The slurry was applied onone surface of a copper foil serving as a collector by the doctor blade method, andthe resultant foil was dried under vacuum at a temperature of 150°C for 2 hours.In this manner, a plate-shaped negative electrode (with a size of 6.6 cm x 2.6 cm x0.15 cm) was prepared. :An electrolyte solution was prepared by dissolving, in a concentration of 1mole per liter, LiPF6 in a mixed solvent including ethylene carbonate and diethylcarbonate in a ratio by volume of 1:1. :10152025CA 02265296 l999-03- 15Card type sealed lithium secondary batteries were manufactured by usingthe aforementioned positive and negative electrodes and electrolyte solution.The manufacturing procedures for these sealed batteries will now be describedwith reference to the accompanying drawings.With regard to each battery, an electrode body 1 was fabricated bysuccessively stacking the positive electrode, a separator impregnated with theelectrolyte solution and the negative electrode. Also, two sheets of a first sealingmaterial A each with a length of 9 cm, a width of 5 cm and a thickness of 100 um were respectively cut, at the centers thereof, into a size with a length of 7 cmand a width of 3 cm. Thus, two sheets of the first sealing material A to be used ineach battery were obtained. Then, a 30-mesh sheet of a second sealing materialB was cut, at the center thereof, into a size with a length of 7 cm and a width of 3cm. Thus, the second sealing material B to be used in each battery was obtained.The second sealing material B was sandwiched between the two sheets of the firstsealing material A, thereby preparing an electrical insulating sealing material Cfor each battery. However, in batteries A5 and A6, another type of electricalinsulating sealing material C obtained as follows was used: 0.1 g of a powder (ofthe second sealing material B) with an average particle size of 20 [L m wassandwiched between two sheets (of the first sealing material A) each with a lengthof 9 cm, a width of 5 cm and a thickness of 100 u m. The resultant sheets werepressed at a pressure of 100 kgf/cm”, thereby obtaining a sheet with a thickness of230 u m. This sheet was cut, at the center thereof, into a size with a length of 7cm and a width of 3 cm, which was used as the electrical insulating sealingmaterial C for these batteries.Next, as is shown in Figure 1, a negative electrode housing member 2a of a710152025CA 02265296 l999-03- 15stainless foil (SUS 304) was placed on a support M. The electrode body 1 wasplaced at the center of the negative electrode housing member 2a, and the sealingmaterial C (not shown) was placed in the periphery of the negative electrodehousing member 2a. Thereafter, a positive electrode housing member 2b of analuminum foil was placed on top.Then, an elevation type mold W for sealing (with a frame having athickness of 1 cm) connected with a heater (not shown) was lowered. With apressure of 5 kgf/cm2 applied to the positive electrode housing member 2b, themold W was heated to a temperature of 140°C (whereas 170°C and 215°C inmanufacture of batteries A3 and A4, respectively) by turning the heater on, andthe temperature was retained for 5 seconds, thereby melting the first sealingmaterial A. Thereafter, the heater was turned off so as to decrease thetemperature of the mold W, and thus, the negative electrode housing member 2aand the positive electrode housing member 2b were adhered to the electricalinsulating sealing material C. In this manner, each of batteries A1 through A6was manufactured. These batteries are present batteries manufactured inaccordance with the invention. Figure 2 is a schematic sectional View of thepresent battery thus manufactured. The present battery X of Figure 2 comprisesa positive electrode 5, a negative electrode 6, a separator 7, the negative electrodehousing member 2a, the positive electrode housing member 2b and the sealant S.The sealant S includes the first sealing material A that is molten by the heatapplied for sealing and the second sealing material B (in the form of a mesh inFigure 2) that is more difficult to soften by the heat applied for sealing than thefirst sealing material A, and the sealant S has an electrical insulating property.Since the present battery X thus comprises the sealant S including the second810CA 02265296 l999-03- 15sealing material B that is difficult to soften by the heat applied for sealing, thebattery has less fear of short-circuit. In addition, there is less fear of a sealingfailure, and hence, the capacity scarcely decreases through repeated charge-discharge cycles. :A battery C1 was manufactured in the same manner as described abovewith regard to the battery A1 (sealed at a temperature of 140°C) except that twosheets of polyethylene (i.e., the first sealing material A) alone were stacked toobtain the electrical insulating sealing material. The battery C1 is acomparative battery manufactured by a conventional method.Table 1 lists the first sealing materials A and the second sealing materialsB used in the respective batteries, whereas a softening point of Table 1 is a vicatsoftening temperature.CA 02265296 l999-03- 15Table 1:Battery First sealing materialA Second sealing material BA1 polyethylene poly(ethylene terephthalate)(melting point: 135°C) (mesh)(soflaening point: 255°C)A2 polyethylene polypropylene(melting point: 135°C) (mesh)(sofiening point: 1 50°C)A3 polypropylene poly(ethylene terephthalate)(melting point: 165°C) (mesh)(softening point: 255°C)A4 polybutene poly(ethylene terephthalate)(melting point: 210°C) (mesh)(softening point: 255°C)A5 polyethylene poly(ethylene terephthalate)(melting point: 135°C) (powder with averageparticle size of 20 LL m)(softening point: 255°C)A6 polyethylene alumina(melting point: 135°C) (powder with averageparticle size of 20 u m)(not softened at 300°Cor lower)C1 polyethylene not used(melting point: 135°C)10CA 02265296 l999-03- 15Internal resistances of 100 batteries were measured with regard to each ofthe aforementioned kinds of batteries so as to examine the incidence (%) of ashort-circuit battery. A battery having an internal resistance of 1 Q or less at 1kHz was determined to be a short-circuit battery. The thus obtained incidence isshown in Table 2:Table 2:Battery Incidence of short-circuit (%)A1A3A4A5A6C1 11Ha-cor-InI>t—A111015CA 02265296 l999-03- 15As is shown in Table 2, the incidence of short-circuit in the presentbatteries A1 through A6 is much lower than that in the comparative battery C1manufactured by the conventional method. In particular, the incidence of short-circuit is as low as merely 1% in the batteries A1, A3, A5 and A6, in which adifference between the melting point of the first sealing material A and thesoftening point of the second sealing material B is 50°C or more.With regard to twenty batteries of each kind where no short-circuit wascaused, 200 charge-discharge cycles were run, in which each battery was chargedat 50 mA to 4.1 V and discharged at 50 mA to 2.8 V. Thus, an average capacitydegradation ratio per cycle (%/cycle) up to the 200th cycle defined by the followingformula was obtained. The thus obtained ratios are shown in Table 3, whereinthe capacity degradation ratio is an average of those obtained in the twentybatteries of each kind.Capacity degradation ratio ={(discharge capacity in 1st cycle — discharge capacity in 200th cycle) /discharge capacity in 1st cycle} + 199 (cycles) x 100Table 3:Battery Discharge degradation ratio (%/cycle)A1 0.07A2 0.10A3 0.07A4 0.09A5 0.07A6 0.14Cl 0.221210CA 02265296 l999-03- 15As is shown in Table 3, the capacity degradation ratios of the presentbatteries A1 through A6 manufactured by the present method are much lowerthan that of the comparative battery C1 manufactured by the conventionalmethod. Furthermore, the capacity degradation ratio is particularly low in thebatteries A1 and A3 through A5 which include poly(ethylene terephthalate) as thesecond sealing material B. This seems because entanglement (integration)between poly(ethylene terephthalate) and polyolefin is so good that a sealingfailure scarcely occurs.Obviously, numerous modifications and variations of the present inventionare possible in light of the above teachings. It is therefore to be understood thatwithin the scope of the appended claims the invention may be practiced otherwisethan as specifically described herein.13

Claims (8)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A method of manufacturing a sealed battery comprising a step of forming an electrical insulating sealant S for sealing an opening by placing an electrical insulating material C, including a first sealing material A that is molten by heat applied for sealing and a second sealing material B that is in the form of a mesh or a powder and that is more difficult to soften by the heat applied for sealing than the first sealing material A, on the opening and heating the electrical insulating material C at a temperature sufficient to melt the first sealing material A but at which the second sealing material B is not softened and subsequently cooling the electrical insulating material C.
2. The method of manufacturing a sealed battery according to claim 1, wherein the first sealing material A is polyolefin, and the second sealing material B is poly(ethylene terephthalate), alumina or silica.
3. The method of manufacturing a sealed battery according to claim 1, wherein the first sealing material A is polyethylene or polypropylene having a melting point of 110°C
through 170°C, and the second sealing material B is poly(ethylene terephthalate).
4. The method of manufacturing a sealed battery according to claim 1, wherein there is a difference of 50°C or more between a melting point of the first sealing material A and a softening point of the second sealing material B.
5. A sealed battery comprising an electrical insulating sealant S for sealing an opening, the electrical insulating sealant S including a first sealing material A that is molten by heat applied for sealing and a second sealing material B that is more difficult to soften by the heat applied for sealing than the first sealing material A, said second sealing material B in the form of a mesh.
6. The sealed battery according to claim 5, wherein the first sealing material A is polyolefin, and the second sealing material B is poly(ethylene terephthalate).
7. The sealed battery according to claim 5, wherein the first sealing material A is polyethylene or polypropylene having a melting point of 110°C through 170°C, and the second sealing material B is poly(ethylene terephthalate).
8. The sealed battery according to claim 5, wherein there is a difference of 50°C or more between a melting point of the first sealing material A and a softening point of the second sealing material B.
CA002265296A 1998-03-16 1999-03-15 Sealed battery and method of manufacturing the same Expired - Fee Related CA2265296C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10-87959/1998 1998-03-16
JP8795998A JP3594481B2 (en) 1998-03-16 1998-03-16 Sealed battery and method of manufacturing the same

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CA2265296A1 CA2265296A1 (en) 1999-09-16
CA2265296C true CA2265296C (en) 2006-03-14

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KR101936339B1 (en) * 2015-08-31 2019-04-03 주식회사 엘지화학 Device for Manufacturing Electrode for Secondary Battery Comprising Mold for Providing Electrode Mix Layer
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US6248139B1 (en) 2001-06-19
JPH11265695A (en) 1999-09-28
JP3594481B2 (en) 2004-12-02
US6428926B2 (en) 2002-08-06
CA2265296A1 (en) 1999-09-16
US20010016979A1 (en) 2001-08-30

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